总结分析了腐蚀混凝土梁用FRP片材加固后的疲劳特性.共10根梁试件,其中1个梁未加固未腐蚀作为标准梁;3个梁进行腐蚀但未加固;3个腐蚀梁用GFRP布U型加固;3个梁受拉区用CFRP布进行抗弯加固,同时用GFRP布U型固定.当纵筋腐蚀到5.5%后,用FRP加固.FRP加固后,一些梁立即进行疲劳试验使其破坏,一些梁再进行第二次腐蚀以研究CFRP加固对梁抗腐蚀耐久性的影响.腐蚀坑使钢筋疲劳寿命明显下降.用U型FRP包裹RC梁不能明显改善梁的疲劳性能;但用CFRP加固梁受拉区,可显著提高梁的疲劳性能.预应力加固降低了梁中纵筋应力幅,疲劳寿命随预应力水平的增大而提高,预应力加固使梁的疲劳寿命明显提高.
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